US6273686B1 - Apparatus and method for controlling a rated system pressure - Google Patents
Apparatus and method for controlling a rated system pressure Download PDFInfo
- Publication number
- US6273686B1 US6273686B1 US09/494,575 US49457500A US6273686B1 US 6273686 B1 US6273686 B1 US 6273686B1 US 49457500 A US49457500 A US 49457500A US 6273686 B1 US6273686 B1 US 6273686B1
- Authority
- US
- United States
- Prior art keywords
- pressure
- pump
- check valve
- adjustment member
- actuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2066—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/30515—Load holding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6653—Pressure control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/2574—Bypass or relief controlled by main line fluid condition
- Y10T137/2605—Pressure responsive
- Y10T137/2622—Bypass or relief valve responsive to pressure downstream of outlet valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm
Definitions
- the invention relates to an apparatus and a method for controlling a rated system pressure in a pressure supply system such as a hydraulic system by simultaneously adjusting a pressure relief valve on a pressure generating or input side and operating a switch on the pressure consumption or output side of the pressure supply system.
- Pressure supply systems such as hydraulic or pneumatic systems are operated by a pressure pump at a rated system pressure.
- a pressure pump When such systems are used in clamping operations, for example to hold a workpiece in a machine tool, it is often necessary to adjust the system pressure to a given situation requiring a different rated system pressure which may be higher or lower than the initially adjusted rated system pressure.
- Changing the rated system pressure introduces a relatively large source of error or fault, since at least two elements that influence each other must be adjusted.
- Such pressure supply systems especially hydraulic systems, require a pressure relief valve, which limits the actual pressure to a maximal system pressure and simultaneously determines the safety of the system.
- a pressure switch governs the pressure generating pump, or rather, a motor driving the pump.
- the pressure relief valve controls the maximal pressure in the system by bleeding excess pressure fluid to an overflow line when the pressure exceeds a rated pressure. If it becomes necessary to change the system pressure, then the pressure relief valve and the pressure switch must be adjusted relative to each other in their response characteristic. Even minor errors in the adjustment can result in damage to system components or to pressure-driven devices connected to the system, such as workpiece holding clamps.
- the pressure switch functions imprecisely in the lower pressure range and with a large hysteresis. Adaptation of the system pressure of such a system to a new rated system pressure thus requires that the operating personnel have a great deal of expertise and experience in making such adjustments. Consequently, adjusting the system pressure can be problematic in many cases.
- Prior art teaches mechanically coupling the pressure relief valve and the pressure switch to each other by arranging the valve and the switch on a common shaft.
- the disadvantage of such an arrangement is that a mechanical adjustment across greater pressure ranges is often inaccurate since the spring forces of the elements, i.e. in the pressure relief valve and in the pressure switch, differ. Different pressures are effective on these two elements because of their different tasks. As a result, differential forces flow into the mechanics, thus making it quite difficult and time-consuming to achieve an exact adjustment.
- the invention further aims to avoid or overcome the disadvantages of the prior art and to achieve additional advantages, as are apparent from the present description.
- the above objects have been achieved in a pressure control system for adjusting a rated system pressure by first adjusting a single pressure adjustment member and enforcing any further required adjustments as follow-up adjustments.
- the pressure control system comprises a pressure relief valve, a check valve, a pressure sensor, a switch, a first and a second pressure adjustment member, a microcontroller and an actuator for the second adjustment member, wherein an operation of the actuator is linked to permitting an adjustment of the first pressure adjusting member of the pressure relief valve.
- the pressure relief valve connects a pressure supply line forming an input to a pressure return line.
- the check valve is connected in the pressure supply line between the input, to which a pump supplies fluid under pressure, and a pressure output, to which pressure users, not shown, are connected.
- the pressure sensor is arranged in the pressure supply line for sensing the actual pressure in the supply line and provides an actual pressure signal to the microcontroller, which under normal operating conditions sends a pump control signal to a pressure pump motor to initiate pumping, when or if the actual pressure falls below the rated system pressure.
- the pump normally in the working mode, the pump does not need to work as long as a rated system pressure set in the microcontroller and the actual system pressure are equal to each other. However, if a new rated system pressure higher than the rated previous system pressure is required, the pump must be enabled or rather its motor must be energized even though pressure equality exists.
- the switch of the invention is normally open but is momentarily closed when the system pressure is to be adjusted to a higher rated system pressure by adjusting the pressure relief valve.
- the new rated system pressure is adjusted by adjusting the first pressure adjustment member of the pressure relief valve which changes the response pressure of the pressure relief valve.
- the pressure relief valve according to the invention can only be adjusted if the check valve is momentarily disabled, that is, opened by its actuator and if the pressure relief valve adjustment member is accessible in response to the open status of the check valve, preferably the fully open check valve. Placing the actuator in a check valve open position simultaneously signifies that the rated system pressure is to be adjusted by closing the switch momentarily in addition to opening the check valve. The closed switch sends an enabling signal to the microcontroller to cause a pump control signal which switches the pump motor ON. With the check valve open equal pressures are present between the pressure generation input and the pressure output of the pressure supply line. Since the actuator is now in the check valve open position, the pressure relief valve can now be adjusted to a new higher or lower rated system pressure.
- a value representing a higher or lower system pressure is preferably stored in a memory and displayed on a display of the microcontroller for use by the operator when adjusting the pressure relief valve.
- the actuator and thus the second pressure adjustment member and the check valve are returned to the normal position. If the new rated system pressure is higher than before, the check valve does not need an adjustment. Under normal operating conditions the check valve is open as long as a pressure supply pump is running.
- the linking between the complete opening of the check valve and the enabling of the adjustment of the pressure relief valve can be accomplished electrically or mechanically.
- a mechanical link according to the invention is provided by the actuator having such a configuration that it prohibits access to the first pressure adjustment member during normal operation of the hydraulic system. When the actuator is brought into the adjustment position, an opening in the actuator is aligned with the first pressure adjustment member to allow adjustment of the pressure relief valve by turning the first pressure adjustment member.
- FIG. 1 is a block diagram of the elements of a hydraulic system including the pressure control system of the invention.
- FIG. 2 is a cross-sectional view through the present pressure control system with two valves and a pressure sensor in a common housing.
- FIG. 1 is a block diagram that shows a pump 1 for generating the desired pressure in a pressure supply line or duct, which includes a pressure input I formed by a line 11 and a pressure output O formed by a line 8 .
- the pressure output line 8 leads to pressure consumer elements, i.e. pressure-operated clamps or other devices that function dependent upon an adequate pressure supply.
- the pressure fluid returns to a reservoir D of the pump 1 through a return flow line 9 .
- a pressure relief valve 2 controls the system pressure by bleeding excess pressure fluid into an overflow or by-pass line A, B, C which returns excess fluid to the reservoir D.
- a check valve 4 that statically seals the pressure input I from the pressure output O is provided between the pressure input line 11 and the pressure output line 8 .
- check valve 4 must be open, preferably fully open, as a first condition of any adjustment of the pressure relief valve 2 to a required rated system pressure in the pressure supply line 11 , 8 .
- any adjustment of the pressure relief valve 2 must be possible only if the check valve 4 is open.
- the pump 1 must be running as a third condition.
- FIG. 1 also shows a microcontroller 5 as the main control element in the system.
- the microcontroller 5 maintains and monitors the rated system pressure by closed loop control during normal operation of the system.
- the microcontroller 5 receives actual system pressure information from a pressure sensor 3 .
- the pressure sensor 3 senses the actual system pressure on the pressure output side when the check valve 4 is closed. However, when the check valve 4 is open, the pressure sensor 3 senses the equalized system pressure in the pressure supply lines 8 and 11 .
- the microcontroller 5 further comprises a first output terminal 14 for providing a feedback control signal for operating a pump motor M of the pump 1 and a second output terminal 15 for providing system status signals to external control devices for making corrections in the pressure control system. Under normal operating conditions the pump needs to run only if the actual system pressure as sensed by the sensor 3 falls below a rated system pressure stored in a memory 6 .
- the microcontroller 5 includes a comparator CO for comparing actual and rated system pressures.
- the comparator CO compares an actual pressure signal received from the pressure sensor 3 preferably through an A/D converter, with the rated system pressure entered through a keyboard KB and stored in the memory 6 . If the comparator CO determines that the actual system pressure is below the rated system pressure, the feedback control signal is supplied to the pump motor M of the pump 1 to initiate pumping.
- a conductor 10 A connects an output of the switch 10 to an input of the microcontroller 5 .
- the switch 10 is a normally-open magnetically-operated reed switch that, when closed, sends a signal to the microcontroller 5 to provide a pump control signal at the output 14 , which will initiate pumping even if no pumping is needed according to the comparator output. This extra pumping satisfies the above mentioned third condition which will be described in more detail below.
- the switch 10 is closed momentarily through the movement of the actuator 16 when the rated system pressure is to be adjusted to a higher value by adjusting the pressure relief valve 2 at a time when the pump is not yet running because the current rated and actual pressures are equal.
- the signal from the switch 10 overrides the pump OFF status provided at this time by the comparator CO.
- a pump ON condition is enforced at least during an upward adjustment of the rated system pressure.
- the pump 1 may be switched OFF when the system pressure is to be adjusted downward, or may continue to pump fluid, in which case, the pressure relief valve 2 will cause excess pressure fluid to flow through the by-pass line A, B, C into the reservoir D.
- Other sensors and measuring devices such as a temperature sensor TS and/or a flow sensor FS, may also be included in the pressure control system to provide the microcontroller 5 with additional information to be used for error recognition and correction by generating respective signals at the output 15 .
- flow sensors FS or temperature sensors TS may be installed in any one of the pressure supply lines 8 , 11 and/or the return flow line 9 and have outputs that are connected to respective inputs of the microcontroller 5 .
- the microcontroller 5 Upon receiving input signals from such sensors, the microcontroller 5 processes these signals to generate respective system status signals for the output terminal 15 , to which external control or warning devices, not shown, may be connected.
- An optical display panel 7 shown in FIG. 1 is connected to the microcontroller 5 by a data bus.
- Various informations can be displayed for the operator on the display 7 , such as the actual system pressure, the new rated system pressure during an adjustment operation, as well as other information, e.g. temperatures, flow rates, and the like.
- the memory 6 is preferably a rewritable, non-volatile memory and is part of the microcontroller 5 . Each information stored in this memory 6 remains there until it is overwritten by new information.
- rated system pressure values are entered into the memory 6 through the keyboard KB as mentioned above.
- FIG. 2 shows a cross-sectional view of an example embodiment of the pressure control system, or so-called aggregate, of the invention. All system elements form a single unit arranged in a common housing 18 .
- the housing 18 includes the pressure supply lines or ducts 8 , 11 , an inlet port I connected to the pressure port of the pump 1 , and an outlet O connectable to pressure users, not shown.
- the housing further includes a vent V, a cavity enclosing the pressure relief valve 2 , a further cavity enclosing the check valve 4 , and a third cavity for the pressure sensor 3 .
- the third cavity includes a lead through 3 A for electrical conductors.
- a first pressure adjustment member 13 for adjusting the response pressure of the pressure relief valve 2 is positioned in the housing above the pressure relief valve 2 .
- the pressure relief valve 2 can be adjusted to a rated system pressure by adjusting this first pressure adjustment member 13 , however only if the above mentioned three conditions are satisfied by the actuator 16 and the switch 10 .
- a second adjustment member 12 for opening the check valve 4 is connected to the actuator 16 , which is a knurled disk, for example.
- the actuator 16 has a configuration which prevents access to the first adjustment member 13 of the pressure relief valve 2 when the check valve 4 is in its normal operating state.
- the actuator 16 provides access to the member 13 when the check valve 4 is brought into the fully open position by the actuator 16 .
- the actuator 16 is provided with an opening 17 such as a through-bore that aligns precisely with the first pressure adjustment member 13 only when the actuator 16 is in the adjustment position, whereby the check valve has been opened to satisfy the first condition (check valve open) and the second condition (pressure relief valve accessible) for permitting an adjustment operation by turning the first adjustment member 13 .
- an adjustment of a new higher rated system pressure can take place only when a signal is sent to the microcontroller 5 that the rated system pressure is to be raised.
- the actuator 16 by its movement that opens the check valve 4 , closes the switch 10 momentarily.
- the respective signal tells the microcontroller 5 that the pump motor M is to be energized even though the comparator CO recognizes that the currently measured actual pressure equals the current rated pressure in the memory 6 .
- the switch 10 is a magnetically-operated reed switch and a magnet 10 B arranged on the actuator 16 operates the switch 10 when the actuator 16 is moved to open the check valve 4 .
- any type of position sensing switches can be used, such as a proximity switch, a piezo switch or the like capable of sensing a movement of the actuator 16 .
- Adjusting the first pressure adjustment member 13 with a tool inserted into the cavity 13 A through the opening 17 sets the response pressure at the pressure relief valve 2 to the desired value which is measured or sensed by the sensor 3 and indicated by the display 7 .
- the operator observes the display and stops turning the member 13 when the new rated pressure is displayed.
- the actuator 16 is then returned to its home position, thereby preventing again access to the first adjustment member 13 and returning the check valve 4 to its normal operating condition.
- the combination of the pressure relief valve 2 and the first pressure adjustment member 13 makes it possible to change the system pressure manually as described.
- This manual solution can be replaced by an electrically actuatable unit.
- an electric motor is connected to the second pressure adjustment member 12 , in place of the actuator 16 , to open the check valve 4 and provide for an adjustment of the pressure relief valve 2 by a rotation of the first pressure adjustment member 13 coupled to such motor drive.
- the check valve 4 can again function for its purpose of blocking any backflow provided the new rated system pressure is higher than the previous rated system pressure. However, when the new rated system pressure is lower, the check valve may need a corresponding downward adjustment.
- This adjustment of the check valve 4 can be accomplished by inserting a tool into a cavity 12 A to turn a spring bias adjustment member 4 A of the check valve 4 until the biasing force of the spring 4 B accommodates the new lower rated system pressure.
- the pressures at the pressure relief valve 2 and the pressure sensor 3 are equalized during the adjustment operation because the check valve 4 is open. Consequently, the stored new rated system pressure corresponds to the adjustment value at the pressure relief valve 2 .
- the microcontroller 5 can now, with the aid of the rated and actual pressure values, set the switching points for the pump 1 and the release of switching elements.
- any change at the pressure relief valve 2 is reflected in the pressure in the pressure supply lines 11 , 8 specifically in the pump connected line section 11 and in the output line section 8 . Consequently, all switching points are defined and a dependency is created among all switching points, as well as among the couplings of the pressure output line 8 , the return flow line 9 , and the pressure input line 11 .
- the check valve 4 When the actuator 16 is returned to the home position, the check valve 4 is closed again and the pressure output line 8 is decoupled from the pressure input line 11 . Should the actual pressure in the pressure output line 8 drop below the rated system pressure, for any reason, the pressure drop will be signaled to the microcontroller 5 by the pressure sensor 3 . The microcontroller 5 will then immediately send a control signal through the terminal 14 to the motor M to operate pump 1 for maintaining the new rated system pressure.
- the pressure control system also provides an error or fault recognition capability, depending on the various sensors TS, FS that are installed in the system and connected to the microcontroller 5 .
- the microcontroller 5 can send out system status signals 15 to external control or warning devices (not shown) when an error has been detected. These external devices can serve to display information or give visual or acoustic warnings, or may also intervene in the present system, which is preferably, but not necessarily a hydraulic system.
Abstract
Description
Claims (17)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999103404 DE19903404A1 (en) | 1999-01-29 | 1999-01-29 | Hydraulic unit |
DE19903404 | 1999-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US6273686B1 true US6273686B1 (en) | 2001-08-14 |
Family
ID=7895685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/494,575 Expired - Fee Related US6273686B1 (en) | 1999-01-29 | 2000-01-31 | Apparatus and method for controlling a rated system pressure |
Country Status (4)
Country | Link |
---|---|
US (1) | US6273686B1 (en) |
EP (1) | EP1024298B1 (en) |
AT (1) | ATE263928T1 (en) |
DE (2) | DE19903404A1 (en) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050287009A1 (en) * | 2002-11-28 | 2005-12-29 | Tadashi Kukitome | Metered quantity transfer device |
US7071429B1 (en) * | 2005-09-23 | 2006-07-04 | Anderson Richard P | Linear adjustment operator for pressure control of paint pumps |
EP1702655A1 (en) * | 2005-03-17 | 2006-09-20 | Gary Richard Noble | Improved sprinkler test system |
US20080003114A1 (en) * | 2006-06-29 | 2008-01-03 | Levin Alan R | Drain safety and pump control device |
US20080050250A1 (en) * | 2006-08-25 | 2008-02-28 | Haldex Brake Corporation | Air supply system with reduced oil passing in compressor |
US20100189577A1 (en) * | 2009-01-23 | 2010-07-29 | Idex Aodd, Inc. | Method for Increasing Compressed Air Efficiency In a Pump |
US20100284834A1 (en) * | 2009-05-08 | 2010-11-11 | Idex Aodd, Inc. | Air Operated Diaphragm Pump With Electric Generator |
US20100313958A1 (en) * | 2009-06-11 | 2010-12-16 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
US20110142692A1 (en) * | 2009-12-16 | 2011-06-16 | Idex Aodd, Inc. | Air Logic Controller |
US9453505B2 (en) | 2012-06-07 | 2016-09-27 | Asco Power Technologies, L.P. | Methods and systems for monitoring a power supply for a fire pump motor |
US9482220B2 (en) | 2012-06-07 | 2016-11-01 | Asco Power Technologies, L.P. | Dual redundancy in fire pump controllers |
US9594098B2 (en) | 2009-09-25 | 2017-03-14 | Belkin International Inc. | Systems and methods for measuring electrical power usage in a structure and systems and methods of calibrating the same |
US20170213451A1 (en) | 2016-01-22 | 2017-07-27 | Hayward Industries, Inc. | Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment |
US9766277B2 (en) | 2009-09-25 | 2017-09-19 | Belkin International, Inc. | Self-calibrating contactless power consumption sensing |
US9857449B2 (en) | 2010-07-02 | 2018-01-02 | Belkin International, Inc. | System and method for monitoring electrical power usage in an electrical power infrastructure of a building |
US10030647B2 (en) | 2010-02-25 | 2018-07-24 | Hayward Industries, Inc. | Universal mount for a variable speed pump drive user interface |
US10094095B2 (en) | 2016-11-04 | 2018-10-09 | Phyn, Llc | System and method for leak characterization after shutoff of pressurization source |
US10179256B2 (en) | 2013-03-13 | 2019-01-15 | Asco Power Technologies, L.P. | Fire pump room system integrator |
US10240593B2 (en) | 2011-03-04 | 2019-03-26 | Asco Power Technologies, L.P. | Systems and methods of controlling pressure maintenance pumps and data logging pump operations |
US10247765B2 (en) | 2007-09-18 | 2019-04-02 | Georgia Tech Research Corporation | Detecting actuation of electrical devices using electrical noise over a power line |
US10352814B2 (en) | 2015-11-10 | 2019-07-16 | Phyn Llc | Water leak detection using pressure sensing |
US10527516B2 (en) | 2017-11-20 | 2020-01-07 | Phyn Llc | Passive leak detection for building water supply |
US10718337B2 (en) | 2016-09-22 | 2020-07-21 | Hayward Industries, Inc. | Self-priming dedicated water feature pump |
US20200319621A1 (en) | 2016-01-22 | 2020-10-08 | Hayward Industries, Inc. | Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment |
US10976713B2 (en) | 2013-03-15 | 2021-04-13 | Hayward Industries, Inc. | Modular pool/spa control system |
US11079776B2 (en) * | 2017-08-30 | 2021-08-03 | The Esab Group Inc. | Hybrid flow and pressure regulation |
US20220412342A1 (en) * | 2021-06-28 | 2022-12-29 | Honda Motor Co., Ltd. | Decompression system and decompression method |
US11759914B2 (en) | 2020-08-06 | 2023-09-19 | Mate Precision Technologies Inc. | Vise assembly |
US11878381B2 (en) | 2020-08-06 | 2024-01-23 | Mate Precision Technologies Inc. | Tooling base assembly |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106522312A (en) * | 2016-12-09 | 2017-03-22 | 屈兆辉 | Multi-pump parallel-connection variable frequency and constant pressure control system |
CN114446728B (en) * | 2021-12-20 | 2024-03-22 | 河南平高电气股份有限公司 | GIS circuit breaker dish spring hydraulic mechanism energy storage pressure control device and circuit breaker |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3561541A (en) * | 1967-09-21 | 1971-02-09 | Roger W Woelfel | Tractor and implement hydraulic control system |
US3739690A (en) * | 1971-07-19 | 1973-06-19 | Caterpillar Tractor Co | Pilot operated control valve |
US3865013A (en) * | 1973-11-12 | 1975-02-11 | Worthington Cei | Auxiliary tool control circuit |
US3889340A (en) * | 1974-02-21 | 1975-06-17 | Bouligny Inc R H | Hydraulic pressure intensifier system |
US3967646A (en) * | 1974-05-13 | 1976-07-06 | Owatonna Tool Company | Three-way control valve |
DE3232536A1 (en) | 1982-09-01 | 1984-03-01 | Herion-Werke Kg, 7012 Fellbach | VALVE ARRANGEMENT FOR CONTROLLING AND MONITORING THE WORKING PRESSURE OF A CONSUMER |
US5634778A (en) * | 1994-11-30 | 1997-06-03 | Hein-Werner Corporation | Remote control pump |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56114016A (en) * | 1980-02-13 | 1981-09-08 | Aida Eng Ltd | Digital pressure setting method |
JPH0781365A (en) * | 1993-09-08 | 1995-03-28 | Aisin Seiki Co Ltd | High adjusting device for automobile |
DE29808294U1 (en) * | 1998-05-07 | 1998-08-13 | Heilmeier & Weinlein | Electro-hydraulic clamping module |
-
1999
- 1999-01-29 DE DE1999103404 patent/DE19903404A1/en not_active Withdrawn
-
2000
- 2000-01-08 AT AT00100391T patent/ATE263928T1/en not_active IP Right Cessation
- 2000-01-08 EP EP20000100391 patent/EP1024298B1/en not_active Expired - Lifetime
- 2000-01-08 DE DE50005946T patent/DE50005946D1/en not_active Expired - Fee Related
- 2000-01-31 US US09/494,575 patent/US6273686B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3561541A (en) * | 1967-09-21 | 1971-02-09 | Roger W Woelfel | Tractor and implement hydraulic control system |
US3739690A (en) * | 1971-07-19 | 1973-06-19 | Caterpillar Tractor Co | Pilot operated control valve |
US3865013A (en) * | 1973-11-12 | 1975-02-11 | Worthington Cei | Auxiliary tool control circuit |
US3889340A (en) * | 1974-02-21 | 1975-06-17 | Bouligny Inc R H | Hydraulic pressure intensifier system |
US3967646A (en) * | 1974-05-13 | 1976-07-06 | Owatonna Tool Company | Three-way control valve |
DE3232536A1 (en) | 1982-09-01 | 1984-03-01 | Herion-Werke Kg, 7012 Fellbach | VALVE ARRANGEMENT FOR CONTROLLING AND MONITORING THE WORKING PRESSURE OF A CONSUMER |
US5634778A (en) * | 1994-11-30 | 1997-06-03 | Hein-Werner Corporation | Remote control pump |
Cited By (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050287009A1 (en) * | 2002-11-28 | 2005-12-29 | Tadashi Kukitome | Metered quantity transfer device |
EP1702655A1 (en) * | 2005-03-17 | 2006-09-20 | Gary Richard Noble | Improved sprinkler test system |
US7071429B1 (en) * | 2005-09-23 | 2006-07-04 | Anderson Richard P | Linear adjustment operator for pressure control of paint pumps |
US7931447B2 (en) | 2006-06-29 | 2011-04-26 | Hayward Industries, Inc. | Drain safety and pump control device |
US20080003114A1 (en) * | 2006-06-29 | 2008-01-03 | Levin Alan R | Drain safety and pump control device |
US20080050250A1 (en) * | 2006-08-25 | 2008-02-28 | Haldex Brake Corporation | Air supply system with reduced oil passing in compressor |
US11119141B2 (en) | 2007-09-18 | 2021-09-14 | Georgia Tech Research Corporation | Detecting actuation of electrical devices using electrical noise over a power line |
US10247765B2 (en) | 2007-09-18 | 2019-04-02 | Georgia Tech Research Corporation | Detecting actuation of electrical devices using electrical noise over a power line |
US8801404B2 (en) | 2009-01-23 | 2014-08-12 | Warren Rupp, Inc. | Method for increasing compressed air efficiency in a pump |
US20100189577A1 (en) * | 2009-01-23 | 2010-07-29 | Idex Aodd, Inc. | Method for Increasing Compressed Air Efficiency In a Pump |
US9316218B2 (en) | 2009-01-23 | 2016-04-19 | Warren Rupp, Inc. | Method and apparatus for increasing compressed air efficiency in a pump |
US8485792B2 (en) | 2009-01-23 | 2013-07-16 | Warren Rupp, Inc. | Method for increasing compressed air efficiency in a pump |
US8608460B2 (en) | 2009-01-23 | 2013-12-17 | Warren Rupp, Inc. | Method and apparatus for increasing compressed air efficiency in a pump |
US20100284834A1 (en) * | 2009-05-08 | 2010-11-11 | Idex Aodd, Inc. | Air Operated Diaphragm Pump With Electric Generator |
US8425208B2 (en) | 2009-05-08 | 2013-04-23 | Warren Rupp, Inc. | Air operated diaphragm pump with electric generator |
TWI503762B (en) * | 2009-06-11 | 2015-10-11 | Univ Washington | Method, medium, apparatus, and system for sensing events affecting liquid flow in a liquid distribution system |
US9939299B2 (en) | 2009-06-11 | 2018-04-10 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
US9250105B2 (en) | 2009-06-11 | 2016-02-02 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
US8457908B2 (en) * | 2009-06-11 | 2013-06-04 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
TWI549072B (en) * | 2009-06-11 | 2016-09-11 | 華盛頓大學 | Method, medium, apparatus, and system for sensing events affecting liquid flow in a liquid distribution system |
US20100313958A1 (en) * | 2009-06-11 | 2010-12-16 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
US11493371B2 (en) | 2009-06-11 | 2022-11-08 | University Of Washington | Sensing events affecting liquid flow in a liquid distribution system |
US9766277B2 (en) | 2009-09-25 | 2017-09-19 | Belkin International, Inc. | Self-calibrating contactless power consumption sensing |
US10371728B2 (en) | 2009-09-25 | 2019-08-06 | Belkin International, Inc. | Self-calibrating contactless power consumption sensing |
US9594098B2 (en) | 2009-09-25 | 2017-03-14 | Belkin International Inc. | Systems and methods for measuring electrical power usage in a structure and systems and methods of calibrating the same |
US8382445B2 (en) | 2009-12-16 | 2013-02-26 | Warren Rupp, Inc. | Air logic controller |
US20110142692A1 (en) * | 2009-12-16 | 2011-06-16 | Idex Aodd, Inc. | Air Logic Controller |
US11572877B2 (en) | 2010-02-25 | 2023-02-07 | Hayward Industries, Inc. | Universal mount for a variable speed pump drive user interface |
US10030647B2 (en) | 2010-02-25 | 2018-07-24 | Hayward Industries, Inc. | Universal mount for a variable speed pump drive user interface |
US9857449B2 (en) | 2010-07-02 | 2018-01-02 | Belkin International, Inc. | System and method for monitoring electrical power usage in an electrical power infrastructure of a building |
US10459012B2 (en) | 2010-07-02 | 2019-10-29 | Belkin International, Inc. | System for monitoring electrical power usage of a structure and method of same |
US10345423B2 (en) | 2010-07-02 | 2019-07-09 | Belkin International Inc. | System and method for monitoring electrical power usage in an electrical power infrastructure of a building |
US10240593B2 (en) | 2011-03-04 | 2019-03-26 | Asco Power Technologies, L.P. | Systems and methods of controlling pressure maintenance pumps and data logging pump operations |
US9482220B2 (en) | 2012-06-07 | 2016-11-01 | Asco Power Technologies, L.P. | Dual redundancy in fire pump controllers |
US9453505B2 (en) | 2012-06-07 | 2016-09-27 | Asco Power Technologies, L.P. | Methods and systems for monitoring a power supply for a fire pump motor |
US10179256B2 (en) | 2013-03-13 | 2019-01-15 | Asco Power Technologies, L.P. | Fire pump room system integrator |
US11822300B2 (en) | 2013-03-15 | 2023-11-21 | Hayward Industries, Inc. | Modular pool/spa control system |
US10976713B2 (en) | 2013-03-15 | 2021-04-13 | Hayward Industries, Inc. | Modular pool/spa control system |
US10962439B2 (en) | 2015-11-10 | 2021-03-30 | Phyn, Llc | Water leak detection using pressure sensing |
US10352814B2 (en) | 2015-11-10 | 2019-07-16 | Phyn Llc | Water leak detection using pressure sensing |
US11709108B2 (en) | 2015-11-10 | 2023-07-25 | Phyn, Llc | Water leak detection using pressure sensing |
US20170213451A1 (en) | 2016-01-22 | 2017-07-27 | Hayward Industries, Inc. | Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment |
US10363197B2 (en) | 2016-01-22 | 2019-07-30 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US20200319621A1 (en) | 2016-01-22 | 2020-10-08 | Hayward Industries, Inc. | Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment |
US10272014B2 (en) | 2016-01-22 | 2019-04-30 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US11000449B2 (en) | 2016-01-22 | 2021-05-11 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US11720085B2 (en) | 2016-01-22 | 2023-08-08 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US11096862B2 (en) | 2016-01-22 | 2021-08-24 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US10219975B2 (en) | 2016-01-22 | 2019-03-05 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US11122669B2 (en) | 2016-01-22 | 2021-09-14 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US11129256B2 (en) | 2016-01-22 | 2021-09-21 | Hayward Industries, Inc. | Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment |
US10718337B2 (en) | 2016-09-22 | 2020-07-21 | Hayward Industries, Inc. | Self-priming dedicated water feature pump |
US10094095B2 (en) | 2016-11-04 | 2018-10-09 | Phyn, Llc | System and method for leak characterization after shutoff of pressurization source |
US11079776B2 (en) * | 2017-08-30 | 2021-08-03 | The Esab Group Inc. | Hybrid flow and pressure regulation |
US11561150B2 (en) | 2017-11-20 | 2023-01-24 | Phyn Llc | Passive leak detection for building water supply |
US10935455B2 (en) | 2017-11-20 | 2021-03-02 | Phyn Llc | Passive leak detection for building water supply |
US10527516B2 (en) | 2017-11-20 | 2020-01-07 | Phyn Llc | Passive leak detection for building water supply |
US11759914B2 (en) | 2020-08-06 | 2023-09-19 | Mate Precision Technologies Inc. | Vise assembly |
US11878381B2 (en) | 2020-08-06 | 2024-01-23 | Mate Precision Technologies Inc. | Tooling base assembly |
US20220412342A1 (en) * | 2021-06-28 | 2022-12-29 | Honda Motor Co., Ltd. | Decompression system and decompression method |
US11867170B2 (en) * | 2021-06-28 | 2024-01-09 | Honda Motor Co., Ltd. | Decompression system and decompression method |
Also Published As
Publication number | Publication date |
---|---|
EP1024298A3 (en) | 2001-01-10 |
EP1024298A2 (en) | 2000-08-02 |
EP1024298B1 (en) | 2004-04-07 |
DE19903404A1 (en) | 2000-08-03 |
DE50005946D1 (en) | 2004-05-13 |
ATE263928T1 (en) | 2004-04-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6273686B1 (en) | Apparatus and method for controlling a rated system pressure | |
EP1020648B1 (en) | Method and device for controlling work machine | |
EP1790859B1 (en) | Hydraulic controller for working machine | |
US6055484A (en) | Tool monitor and assembly qualifier | |
US5431182A (en) | Smart valve positioner | |
JP3110752B2 (en) | Device for controlling liquid compression | |
US6146100A (en) | Compressor unit and control device used thereby | |
AU773739B2 (en) | A self-calibrating system and method for controlling a hydraulically operated device | |
US20070177985A1 (en) | Integral sensor and control for dry run and flow fault protection of a pump | |
WO1996027741A1 (en) | Hydraulic controller | |
US5621398A (en) | Programmable switch | |
US5317871A (en) | Circuit capable of varying pump discharge volume in closed center-load sensing system | |
EP0810497A4 (en) | Method of output correction for control apparatus, the control apparatus, and hydraulic pump control apparatus | |
JPH06503637A (en) | Hydraulic system with pump and load | |
US6695278B2 (en) | Proportional flow control valve | |
US5481482A (en) | Pressure information processing system suitable for use in a vacuum unit | |
US20100181513A1 (en) | Method and electronic device for finding the opening point for a regulated electropneumatic valve of a pneumatic actuating drive | |
US3390694A (en) | Position control apparatus | |
CN106980261B (en) | Positioning device | |
US3363157A (en) | Manual and automatic servo system | |
US5032062A (en) | Compressor demand control system for long term compressor operation | |
US20230151806A1 (en) | Variable displacement hydraulic pump | |
US6868861B2 (en) | Level control system for sheet casting process | |
JPH07239717A (en) | Method for automatic adjustment of operation range of servo controller | |
JPH11280701A (en) | Hydraulic controller |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: A. ROEMHELD GMBH & CO KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KROELL, HARALD;PITZ, WALTER;REEL/FRAME:010782/0929;SIGNING DATES FROM 20000202 TO 20000213 |
|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20090814 |